Food processing

Digestion starts in the mouth, where saliva containing a digestive enzyme called amylase lubricates food as it is chewed. In the stomach proteins and fats are broken down in an acidic environment, and salt, water, and alcohol are absorbed. Beyond the stomach (in the duodenum), acidity is neutralized before food is treated by secretions from associated digestive organs—the liver, gallbladder, and pancreas. Bile from the liver and gallbladder emulsifies fats, and pancreatic enzymes break down proteins, starch, and fats.

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